I agree with Mikejb. I had the same issue and it was being caused by the cooling system. It ended up being a bad radiator cap that was not allowing the cooling system to build pressure.mikejb said:If your reading the stock gauge don't trust it. Only true way to check is buy and hook up a water temp gauge. Bad sending unit? Another thing to check is your cooling system has pressure? BTW I miss my 93 reef blue coupe.